Welch Allyn RETeval-DR, Directions For Use Manual

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Troubleshooting
CAUTION A defective device should not be used. Parts which may be
broken or missing or are visibly worn, distorted, or contaminated should be
replaced immediately with clean, genuine replacement parts manufactured
by or available from Welch Allyn.
The RETeval-DR device runs internal tests and self-checks frequently. Device failures are
obvious; the device will stop functioning and warn the user rather than producing
erroneous or unexpected results.
If the device displays an error message, follow the instructions on the screen to correct
the error, or contact Welch Allyn Technical Support: www.welchallyn.com/service . Note
any error number shown.
The device doesn’t show the Next button after I connect to the sensor strip or
after pressing the Start test button, I get an “The electrodes have been
disconnected” error
The RETeval-DR device monitors the electrical impedance of the connection between
pads on the sensor strip. If the impedance is too high, the Next button won’t be
displayed. During a test, if the electrical impedance gets too high or the inputs saturate
the analog-to-digital converter, the “electrodes disconnected” message is displayed. The
impedance can be too high because of the following reasons.
Problem Solution
The sensor strip lead is not correctly connected to the
sensor strip.
Unclip and reconnect the lead.
The sensor strip isn’t connected to the patient’s skin. Ensure the sensor strip is not resting on the patient’s
sideburns or on heavy makeup. Press down lightly on the
three electrode gel pads on each sensor strip to ensure the
sensor strip is sticking well. Clean the skin with soap and
water or an alcohol wipe and reapply the sensor strip.
The sensor strip may be defective. Use a new sensor strip.
The device won’t let me press the Start test button when I can see the eye or after
pressing the Start test button, I get an “The pupil can no longer be found” error
The RETeval-DR device measures the pupil size and adjusts the brightness of the
flickering light for each flash based upon the pupil size. The Start test button is only
enabled after the pupil is located. During a test, if the device cannot find the pupil for
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